How do you access gta online content in story mode?

Grand Theft Auto V's story mode and GTA Online are distinct game modes that operate separately. The single-player story follows three protagonists—Michael De Santa, Franklin Clinton, and Trevor Philips—through a narrative centered on heists in the fictional state of San Andreas. GTA Online, launched as a separate multiplayer experience, cannot be accessed or played within the story mode. These modes require distinct game sessions: story mode for the single-player campaign, and GTA Online for the multiplayer component. There is no in-game method, setting, or feature that allows players to experience GTA Online's content while playing through the single-player story.